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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b890b8e2f7753fb6d2b3b6d1f39077c32e9c8f88910abcc9d9a3101ddfe484ca' 
  AND token = '1JIDYSDmj3eLCt2wrsw50cwQKQYn9Il/YoNP/X7JvwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}